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Hi
setting file permission may not help . Anybody can do a ps -ef | grep rman to find the connection string. Setting os authentication seems to work fine . I usually put the passwords and other options in a config file and protect that file . within the shell script i read the config file and cut the necessary options for constructing the command line.

==========================================================
This is sample config.rman file
# This is the configuration file for rman backup
# All comments should start with a hash symbol
# Each field should be separated with a (:)
# Field 1 - Instance name
# Field 2 - Instance pass
# Field 3 - Rman User Name
# Field 4 - Rman Passwd
# Field 5 - Rman Repository
#
db1:db1pass:rman:rman:rcvcat_db
db2:db2pass:rman:rman:rcvcat_db
db3:db3pass:rman:rman:rcvcat_db
#
#